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- W2413016786 abstract "Lipoxin A4 (LXA4) is a potent eicosanoid that inhibits IL-1beta-induced activation of human fibroblast like synoviocytes (FLS) via the ALX4 receptor. Serum amyloid A (SAA) is an acute phase reactant with cytokine-like properties. SAA has been shown to bind the same seven transmembrane G protein-coupled receptor ligated by LXA4. Here we compared the inflammatory responses of lipid (LXA4) and peptide (SAA) ligands in human FLS via the shared ALX, and characterized their downstream signaling. LXA4 induced stimulation of tissue inhibitors of metalloproteinase-2, whereas SAA induced interleukin-8 and matrix metalloproteinase-3 production. SAA up-regulated NF-kappaB and AP-1 DNA binding activity, while LXA4 markedly inhibited these responses after IL-1beta stimulation. A human IL-8 promoter luciferase construct was transfected into CHO cells stably expressing ALXR in order to determine the role of NF-kappaB and/or AP-1 in the regulation of IL-8 gene expression. The NF-kappaB pathway proved to be the preeminent for the biological responses elicited by both ligands. These findings suggest that two endogenous molecules, targeting a common receptor, could participate in the pathogenesis of inflammatory arthritis by differentially regulating inflammatory responses in tissues expressing the ALXR." @default.
- W2413016786 created "2016-06-24" @default.
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- W2413016786 date "2004-05-01" @default.
- W2413016786 modified "2023-10-12" @default.
- W2413016786 title "Opposing Regulation of Interleukin-8 and NF-kB Responses by Lipoxin A4 and Serum Amyloid a via the Common Lipoxin a Receptor" @default.
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- W2413016786 doi "https://doi.org/10.1177/039463200401700206" @default.
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